UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549

                                    FORM 40-F

[Check one]

            [_]    REGISTRATION STATEMENT PURSUANT TO SECTION 12 OF
                   THE SECURITIES EXCHANGE ACT OF 1934

                                       OR

            [X]    ANNUAL REPORT PURSUANT TO SECTION 13(a) OR 15(d) OF
                   THE SECURITIES EXCHANGE ACT OF 1934

 For the fiscal year ended  December 31, 2005    Commission File Number 0-30514
                           -------------------                          -------

                                ARC ENERGY TRUST
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             (Exact name of Registrant as specified in its charter)


                                       N/A
--------------------------------------------------------------------------------
         (Translation of Registrant's name into English (if applicable))


                                     ALBERTA
--------------------------------------------------------------------------------
        (Province or other jurisdiction of incorporation or organization)


                                      1311
--------------------------------------------------------------------------------
    (Primary Standard Industrial Classification Code Number (if applicable))


                                 NOT APPLICABLE
--------------------------------------------------------------------------------
             (I.R.S. Employer Identification Number (if applicable))


   2100, 440 2ND AVENUE S.W., CALGARY, ALBERTA, CANADA T2P 5E9 (403) 503-8600
--------------------------------------------------------------------------------
   (Address and telephone number of Registrant's principal executive offices)


         CORPORATION SERVICE COMPANY, 2711 CENTERVILLE ROAD, SUITE 400,
                  WILMINGTON, DELAWARE 19805  (302) 636-5401
--------------------------------------------------------------------------------
            (Name, address (including zip code) and telephone number
        (including area code) of agent for service in the United States)


Securities registered or to be registered pursuant to Section 12(b) of the Act.

                                                 Name of each exchange
           Title of each class                    on which registered

                 N/A                                     N/A
           -------------------                    -------------------

Securities registered or to be registered pursuant to Section 12(g) of the Act.

                                   TRUST UNITS
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                                (Title of Class)


--------------------------------------------------------------------------------
                                (Title of Class)

Securities for which there is a reporting obligation pursuant to Section 15(d)
of the Act.

                                       N/A
--------------------------------------------------------------------------------
                                (Title of Class)

<PAGE>

For annual reports, indicate by check mark the information filed with this Form:

   |X| Annual information form         |X| Audited annual financial statements

Indicate the number of outstanding  shares of each of the issuer's  classes of
capital or common  stock as of the close of the  period  covered by the annual
report.

                            199,104,759 Trust Units

Indicate  by check mark  whether  the  Registrant  by filing  the  information
contained  in this Form is also  thereby  furnishing  the  information  to the
Commission  pursuant to Rule 12g3-2(b)  under the  Securities  Exchange Act of
1934 (the  "Exchange  Act").  If "Yes" is  marked,  indicate  the file  number
assigned to the Registrant in connection with such Rule.

                         [_]  Yes 82-_________   No [X]

Indicate  by check  mark  whether  the  Registrant  (1) has filed all  reports
required  to be filed by  Section 13 or 15(d) of the  Exchange  Act during the
preceding  12 months  (or for such  shorter  period  that the  Registrant  was
required  to file  such  reports)  and (2) has  been  subject  to such  filing
requirements for the past 90 days.

                               [X]  Yes     [_]  No





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<PAGE>

PRINCIPAL DOCUMENTS

The following  documents have been filed as part of this Annual Report on Form
40-F:

A.       ANNUAL INFORMATION FORM

For our Annual  Information  Form for the fiscal year ended December 31, 2005,
see Exhibit 99.1 of this Annual Report on Form 40-F.

B.       AUDITED ANNUAL FINANCIAL STATEMENTS

For our Consolidated  Financial  Statements for the fiscal year ended December
31, 2005, including the report of independent registered chartered accountants
with respect thereto, see Exhibit 99.2 of this Annual Report on Form 40-F. For
a reconciliation of important  differences  between Canadian and United States
generally  accepted  accounting  principles,  see Note 20 of the  Notes to the
Consolidated Financial Statements.

C.       MANAGEMENT'S DISCUSSION AND ANALYSIS AND RESULTS OF OPERATIONS

For  Management's  Discussion  and Analysis and Results of Operations  for the
fiscal year ended December 31, 2005, see Exhibit 99.3 of this Annual Report on
Form 40-F.

CONTROLS AND PROCEDURES

A.       DISCLOSURE CONTROLS AND PROCEDURES

The Registrant's Chief Executive Officer and Chief Financial Officer conducted
an evaluation of the effectiveness of the Registrant's disclosure controls and
procedures  as of the end of the period  covered by this Annual Report on Form
40-F (the "evaluation  date").  Based on that evaluation,  the Chief Executive
Officer and Chief Financial Officer concluded that, as of the evaluation date,
the  design  and  operation  of  the  Registrant's   disclosure  controls  and
procedures  were effective in ensuring that material  information  relating to
the Registrant and its consolidated  subsidiaries  would be made known to them
by others within those entities,  particularly during the period in which this
report was being prepared.

B.       CHANGES IN INTERNAL CONTROL OVER FINANCIAL REPORTING

There have been no changes to the Registrant's internal control over financial
reporting or in other factors that have materially  affected or are reasonably
likely  to  materially  affect  internal  control  over  financial   reporting
subsequent to the evaluation date.


AUDIT COMMITTEE FINANCIAL EXPERT

The Board of Directors (the "Board") of ARC Resources Ltd. has determined that
Mr.  Fred  Dyment  is an audit  committee  financial  expert  (as  defined  in
paragraph  8(b) of  General  Instruction  B to Form  40-F).  Mr.  Dyment is an
independent  member of the Board as defined under New York Stock Exchange Rule
303A(1).

CODE OF ETHICS

The  Registrant  has adopted a code of ethics (as that term is defined in Form
40-F) that applies to its principal  executive  officer,  principal  financial
officer and controller. The code of ethics has been posted on the Registrant's
website at  www.arcresources.com.  Since the  adoption  of the code of ethics,
there  have  not  been  any  amendments  to the  code of  ethics  (except  for
administrative   amendments  to  co-ordinate  the  code  of  ethics  with  the
Registrant's  whistleblower  policy), or waivers,  including implicit waivers,
from any provision of the code of ethics. The

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<PAGE>

Registrant  will  post on its  website  any  amendment  to,  or  waiver  of, a
provision of its code of ethics which requires disclosure within five business
days following the date of any such amendment or waiver.

PRINCIPAL ACCOUNTANT FEES AND SERVICES

AUDIT FEES

The following  sets forth the  aggregate  fees billed for each of the two past
fiscal  years  for  professional  fees  to the  principal  accountants  of the
Registrant  for the audit of the annual  financial  statements or for services
normally   provided  by  the  accountant  in  connection  with  statutory  and
regulatory  filings or engagements for those fiscal years.  All dollar amounts
herein are Canadian dollars.

         Fiscal year ended December 31, 2004    $235,000

         Fiscal year ended December 31, 2005    $280,750

AUDIT-RELATED FEES

The following  sets forth  additional  aggregate  fees to those reported under
"Audit  Fees" in each of the last two fiscal years for  assurance  and related
services  by the  principal  accountant  that are  reasonably  related  to the
performance of the audit or review of the financial statements:

         Fiscal year ended December 31, 2004    $ 46,165

         Fiscal year ended December 31, 2005    $110,900

The services for the fiscal year ended  December 31, 2004 and the services for
the fiscal year ended  December 31, 2005 related to the French  translation of
certain publicly filed financial documents.

TAX FEES

The  following  sets forth the  aggregate  fees billed in each of the last two
fiscal years for professional  services  rendered by the principal  accountant
for municipal property tax compliance, tax advice and tax planning:

         Fiscal year ended December 31, 2004    $ 72,503

         Fiscal year ended December 31, 2005    $110,532

ALL OTHER FEES

The  following  sets forth the  aggregate  fees billed in each of the last two
fiscal years for products and services  provided by the  principal  accountant
not described above:

         Fiscal year ended December 31, 2004    $NIL

         Fiscal year ended December 31, 2005    $NIL

AUDIT COMMITTEE PRE-APPROVAL

The  Registrant's  audit  committee   pre-approves  every  engagement  by  the
Registrant of Deloitte & Touche LLP to render audit or non-audit services. All
of the services described above were approved by the audit committee.

OFF-BALANCE SHEET ARRANGEMENTS

The Registrant has no material off-balance sheet arrangements that have or are
reasonably likely to have a current or

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<PAGE>

future effect on the Registrant's  financial  condition,  changes in financial
condition,  revenues or expenses,  results of operations,  liquidity,  capital
expenditures  or  capital  resources  that is  material  to  investors.  For a
discussion of the Registrant's other off-balance sheet arrangements,  see page
14 of the  Registrant's  Management's  Discussion  and Analysis and Results of
Operations  for the fiscal year ended  December  31,  2005,  which is filed as
Exhibit 99.3 to this Annual Report on Form 40-F.

TABULAR DISCLOSURE OF CONTRACTUAL OBLIGATIONS

See page 14 of the  Registrant's  Management's  Discussion  and  Analysis  and
Results of Operations  for the fiscal year ended  December 31, 2005,  which is
filed as Exhibit 99.3 to this Annual Report on Form 40-F.



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<PAGE>

                 UNDERTAKING AND CONSENT TO SERVICE OF PROCESS

A.       UNDERTAKING

The  Registrant  undertakes  to make  available,  in person  or by  telephone,
representatives  to respond to inquiries made by the Commission  staff, and to
furnish promptly, when requested to do so by the Commission staff, information
relating to: the securities  registered  pursuant to Form 40-F; the securities
in  relation  to which the  obligation  to file an annual  report on Form 40-F
arises; or transactions in said securities.

B.       CONSENT TO SERVICE OF PROCESS

A Form F-X signed by the  Registrant  and its agent for service of process was
previously filed with the Commission in connection with the Trust Units.

Any change to the name and  address of the agent for  service  for  service of
process of the Registrant shall be communicated promptly to the Securities and
Exchange  Commission  by an  amendment  to the Form F-X  referencing  the file
number of the relevant registration statement.



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<PAGE>

                                   SIGNATURES

         Pursuant to the  requirements  of the Exchange  Act,  the  Registrant
certifies  that it meets all of the  requirements  for filing on Form 40-F and
has  duly  caused  this  annual  report  to be  signed  on its  behalf  by the
undersigned, thereto duly authorized.

                                  ARC ENERGY TRUST
                                  (the Registrant)


                                  By   /s/ John P. Dielwart
                                       -------------------------------------
                                       John P. Dielwart
                                       President and Chief Executive Officer

                                  Date: March 29, 2006




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<PAGE>

                                INDEX TO EXHIBITS


EXHIBIT NUMBER                           DESCRIPTION
--------------                           -----------
     99.1         Annual  Information  Form for the fiscal year ended December
                  31, 2005.

     99.2         Consolidated  Financial Statements for the fiscal year ended
                  December  31,  2005 (note 20 to the  Consolidated  Financial
                  Statements  relates to the United States Generally  Accepted
                  Accounting Principles (U.S. GAAP)).

     99.3         Management's   Discussion   and   Analysis  and  Results  of
                  Operations for the fiscal year ended December 31, 2005.

     99.4         Certification  of Chief Executive  Officer  pursuant to Rule
                  13a-14(a) or 15d-14 of the Securities Exchange Act of 1934.

     99.5         Certification  of Chief Financial  Officer  pursuant to Rule
                  13a-14(a) or 15d-14 of the Securities Exchange Act of 1934.

     99.6         Certifications  of Chief Executive  Officer pursuant to Rule
                  13(a)-14(b)  and  Section  1350 of Chapter 63 of Title 18 of
                  the United States Code (18 U.S.C. 1350).

     99.7         Certifications  of Chief Financial  Officer pursuant to Rule
                  13(a)-14(b)  and  Section  1350 of Chapter 63 of Title 18 of
                  the United States Code (18 U.S.C. 1350).

     99.8         Consent of Independent Registered Chartered Accountants.

     99.9         Consent of GLJ Petroleum  Consultants  Ltd. to the inclusion
                  of  the  Report  dated  February  23,  2006  evaluating  the
                  reserves of ARC Resources Ltd. and ARC (Sask.) Energy Trust.



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